11-26-2005, 09:15 PM #1
How To: New 06 supercharger rebuild notes
Here are some points of interest when rebuilding your supercharger with the new 06 rebuild kit.
From now on the new updated clutch kits will come with a new shaft/bearing assembly. The new part number for SC IC units will be 420 881 946 and for the SC units part number 420 881 947.
The new rebuild kits come with everything needed to completely rebuild your supercharger to 06 specs. The new kit is much like the Rotax Racing heavy duty assembly as the shaft is thicker and so are the ceramic washers.
When rebuilding the supercharger it is extremely important that your work area and parts be clean. The supercharger shaft spins up to 45,000 RPM's and any debris could cause a failure.
The tools you will need to rebuild your supercharger are:
529 036 027 - Retaining Key
529 035 947 - Support Plate
529 035 948 - Four Pin Socket
529 035 950 - Bearing Support/Pusher
529 036 025 - Gear Holder Tool
Torque Wrench (dial type preferably)
There are detailed instructions with pictures that come with the new rebuild kit. Follow the instructions precisely!
Things to pay close attention to are the placement of the shaft bearings. You must ensure that the closed cage on both bearings face the supercharger impeller. Incorrectly installing the bearings will result in catastrophic failure.
Also, there are two ceramic washers each with different inside diameters. The washer with the green outer perimiter goes closest to the supercharger housing.
There is now a new proceedure for checking the clutch slipping moment and a new tool to assist you with this proceedure. The tool is a gear holder tool part number 529 036 025.
While the supercharger is held steady with the support plate, hold the gear with the gear holding tool and rotate the impeller cap nut counterclockwise a minimum of 10 complete revolutions. This will dissipate the grease on the ceramic washers and gear enough to get a proper reading when using a torque wrench to measure the slip torque of the clutch.
To measure the slip torque of the clutch, turn the impeller cap nut with the torque wrench while holding the gear. The new clutch should start to slip at a torque of 7 to 12 NM (62-106 inch pounds) A dial type torque wrench works best for this.
And remember, NEVER use synthetic oil in your supercharger equipped Rotax engine.
Last edited by Green Hulk; 07-14-2006 at 09:27 PM.
11-26-2005, 09:21 PM #2
Did you get out and test the clutch and hull today?
11-26-2005, 09:26 PM #3
Sorry, I just saw the other post.
11-26-2005, 09:27 PM #4
Yes i did.
The rideplate truing worked great. Clutch started slipping above 8300 RPM's though. I came home and shimmed it and will give it another shot tomorrow.
01-01-2006, 08:36 PM #5
- Join Date
- Oct 2005
Does anyone know the price for the 420 881 947 kit?...PR...
02-02-2006, 10:44 PM #6
04-22-2006, 03:50 PM #7
Nice detailed instructions Jerry. How would we go about shimming? Where exactly do the shims go when rebuilding?
04-22-2006, 04:01 PM #8
The shims are available from Rotax Racing. They go between the spring washers.
06-16-2006, 03:32 AM #9
- Join Date
- Dec 2005
- Austin, TX
Does anyone have a pdf version of the rebuild instructions?
06-16-2006, 04:46 AM #10
How much would all the tools cost that I would need to do this job? I have (2) SC units I need to do but not sure if it's worth doing my self or have someone do it do to the tool cost?
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